Portion of a speaker



FIG. 1 is a top plan view of a portion of a speaker showing our new design;

FIG. 2 is a front elevational view thereof, the rear elevational view being identical thereto;

FIG. 3 is a left side elevational view thereof, the right side elevational view being identical thereto; and,

FIG. 4 is a top perspective view thereof.

The bottom of the portion of a speaker is unornamented.

The broken lines showing holes are environmental only and form no part of the claimed design. 

The ornamental design for a portion of a speaker, as shown and described. 